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  2. Whizzer (motorcycles) - Wikipedia

    en.wikipedia.org/wiki/Whizzer_(motorcycles)

    In 1948, Whizzer sold its first pre-assembled motorized bicycle, the "Pacemaker", for US$199.50 (equivalent to $2,500 in 2023). [ 1 ] The "Sportsman" – featuring 138cc, 3 hp engine, 20" wheels, kick starter and drum brakes – was released in 1949 for US$224.50 (equivalent to $2,900 in 2023), and US$239.50 (equivalent to $3,100 in 2023) for ...

  3. Four-stroke engine - Wikipedia

    en.wikipedia.org/wiki/Four-stroke_engine

    Four-stroke engines are the most common internal combustion engine design for motorized land transport, [1] being used in automobiles, trucks, diesel trains, light aircraft and motorcycles. The major alternative design is the two-stroke cycle .

  4. Ariel Square Four - Wikipedia

    en.wikipedia.org/wiki/Ariel_Square_Four

    The idea for the engine was rejected by BSA, but adopted by Ariel. Thus it became the Ariel Square Four. In 1966 Phil Vincent wrote in Motor Cycle: "Alas, in 1959 the Square Four went out of production, a victim of the modern trend towards small, high-revving modern power units. The demand had tailed off a bit, and with reduced output, the ...

  5. Motorized bicycle - Wikipedia

    en.wikipedia.org/wiki/Motorized_bicycle

    A motorized bicycle is a bicycle with an motor or engine and transmission used either to power the vehicle unassisted, or to assist with pedalling. Since it sometimes retains both pedals and a discrete connected drive for rider-powered propulsion, the motorized bicycle is in technical terms a true bicycle, albeit a power-assisted one.

  6. Yamaha Genesis engine - Wikipedia

    en.wikipedia.org/wiki/Yamaha_Genesis_engine

    What could be argued is that the Genesis concept (not just the inclination of the engine, although on the FZ750 was a radical 45 degrees, on the FZR1000 a less radical 35 degrees, a feature now generally universally used in the modern (post 1990) sport bike thus allowing downdraft air induction and airbox pressurization, but also the use of ...

  7. Johnson Motor Wheel - Wikipedia

    en.wikipedia.org/wiki/Johnson_Motor_Wheel

    The Motor Wheel had a 2 cycle engine which produced 1HP and had two flywheel magnetos, bronze bearings and a float feed carburetor. The complete kit came with a wheel, hub tire, shock-absorbing spring sprocket holder, wheel sprocket and chain, handlebar controls for choke, throttle and engine shutoff, three quart gas tank and gas line, and all ...